It has been shown that additive effects such as the Faraday effect, the rotation of the polarization plane of linearly polarized light passing through a material placed in the longitudinal magnetic field, can be enhanced in periodic systems resembling photonic crystals [1, 2]. The Faraday effect was measured in Bi₁₂GeO₂₀ (BGO) single crystal doped with Ni and Co nanoparticles and in Tb₃Sc₂Al₃O₁₂-TbScO₃ (TSAG-TSP) eutectic. The measurements were performed in the visible region of the spectrum. The influence of microstructure of the above materials on rotation angle will be discussed.  

Materials were obtained by micro-pulling down method utilizing the self-organization mechanism. In the TSAG-TSP eutectic the micro-rods of perovskite phase are packed pseudo-hexagonally in a garnet matrix [3] and the Faraday effect originate mainly from the terbium ions. The comparison of values of Verdet constant for different diameters of microrods and for light propagated perpendicularly and along the microrods will be presented. The value of the constant is much higher than those that have been reported for any garnet material. The influence of total concentration of Tb on the obtained results is discussed.

In BGO doped with Ni and Co the dependence of Verdet constant on concentration of nanoparticles up to 10 wt.% was investigated. The dependence of Faraday effect on sample orientation was also discussed. The angle of Faraday rotation is higher for BGO doped with Co than for material doped with Ni nanoparticles and increase with increasing of the nanoparticles concentration.

Acknowledgements

This work was partially supported by Polish National Science Centre under project MAESTRO.

[1] M. Inoue, A.V. Baryshev, Magnetophotonic Crystals: The Way to Enhance the Faraday Rotation, Encyclopedia of Materials: Science and Technology, 2008, Pages 1–5.

[2] C. Koerdt, G. L. J. A. Rikken, E. P. Petrov, Faraday effect of photonic crystals, Appl. Phys. Lett., 2003, 82, 1538.

[3] D. A. Pawlak, K. Kolodziejak, S. Turczynski, J. Kisielewski, K. Rożniatowski, R. Diduszko, M. Kaczkan, M. Malinowski, Chem. Mater. 2006, 18(9), 2450-2457.

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